research-article

Coarse-grained mtime update for better fsync() performance

Authors:

Gyeongyeol Choi,

Youjip WonAuthors Info & Claims

SAC '17: Proceedings of the Symposium on Applied Computing

Pages 1534 - 1541

https://doi.org/10.1145/3019612.3019739

Published: 03 April 2017 Publication History

Abstract

This work is dedicated to improve the performance of the fsync(), which is one of the most expensive system calls in UNIX operating systems. Due to the recent advancement of the Flash storage based storage device, the storage device can flush the data blocks in order of magnitudes faster than the legacy HDDs. Often, the rate of flushing the data blocks to the storage device prevails the rate of CPU updating the file system time. The amount of the dirty blocks created in the system depends on the timer interrupt interval of the kernel. Read and write operations update the atime and mtime metadata, respectively. These timestamps are useful; however, there is significant performance degradation due to frequent updates of the metadata. Now in the file system, atime has several options to mediate between usefulness and performance efficiency. Most of the Database Management Systems frequently perform fsync() to guarantee the consistency of user data. The synchronous writes involve journaling overhead of updating mtime metadata in EXT4 file system. However, the effect of frequent update of mtime on write intensive workload has been overlooked. We introduce coarse-grained mtime update scheme to increase the mtime/ctime timestamp update interval while maintaining the same level of resolution for kernel time interrupts. As a result, coarse-grained update interval scheme reduces the journaling overhead with the least effort. The experiment results show that the I/O performance of random workload on mobile and PC increased about 7+ and 107+ against the default mtime update interval, respectively. The result of insert operations on PERSIST mode of SQLite on mobile and PC shows 8.4+ and 45.1+ of I/O performance increase, respectively. On MySQL OLTP workload, the performance increased by 7.9+.

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Cited By

Choi GWon YChen KZhao WMa Y(2018)Analysis for the performance degradation of fsync() in F2FSProceedings of the 9th International Conference on E-Education, E-Business, E-Management and E-Learning10.1145/3183586.3183605(71-75)Online publication date: 11-Jan-2018
https://dl.acm.org/doi/10.1145/3183586.3183605
Son SYoo JWon Y(2017)Guaranteeing the Metadata Update Atomicity in EXT4 File systemProceedings of the 8th Asia-Pacific Workshop on Systems10.1145/3124680.3124722(1-8)Online publication date: 2-Sep-2017
https://dl.acm.org/doi/10.1145/3124680.3124722

Index Terms

Coarse-grained mtime update for better fsync() performance
1. Information systems
  1. Data management systems
2. Software and its engineering
  1. Software organization and properties
    1. Contextual software domains
      1. Operating systems
        File systems management

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Published In

cover image ACM Conferences

SAC '17: Proceedings of the Symposium on Applied Computing

April 2017

2004 pages

ISBN:9781450344869

DOI:10.1145/3019612

Conference Chair:
Sung Y. Shin
South Dakota State University
,
Program Chairs:
Dongwan Shin
New Mexico Tech
,
Maria Lencastre
University of Pernambuco, Brazil

Copyright © 2017 ACM.

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Publication History

Published: 03 April 2017

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IT R&D program MKE/KEIT
MSIP(Ministry of Science, ICT&Future Planning), Korea, under the ITRC(Information Technology Research Center) support program

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SAC 2017

Sponsor:

SIGAPP

SAC 2017: Symposium on Applied Computing

April 3 - 7, 2017

Marrakech, Morocco

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Overall Acceptance Rate 1,650 of 6,669 submissions, 25%

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Cited By

Choi GWon YChen KZhao WMa Y(2018)Analysis for the performance degradation of fsync() in F2FSProceedings of the 9th International Conference on E-Education, E-Business, E-Management and E-Learning10.1145/3183586.3183605(71-75)Online publication date: 11-Jan-2018
https://dl.acm.org/doi/10.1145/3183586.3183605
Son SYoo JWon Y(2017)Guaranteeing the Metadata Update Atomicity in EXT4 File systemProceedings of the 8th Asia-Pacific Workshop on Systems10.1145/3124680.3124722(1-8)Online publication date: 2-Sep-2017
https://dl.acm.org/doi/10.1145/3124680.3124722

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